Improvement in valves for drilling and pumping machines



' 1. NO Improvement m Valves for Dnllmg and Pumpmg Machmes, &c.

5, Patented July 6, 1872.

UNITED STATES PATENT OFFICE.

JOHN NORTH, OF NEW YORK, N. Y.

Specification forming part of Letters Patent No. 129,048, dated July 16, 1872.

' York.

In the accompanying drawing, Figure 1 represents a vertical longitudinal section, Fig. 2 a horizontal section, and Figs. 3 and 4 vertical transverse sections, of my invention, the lines 0 c and K K, Fig. 2, indicating, respectively,.thc planes of section for the last two figures.

Similar letters of reference indicate correspondin g parts.

This invention relates to a new steam-valve for use in connection with such engines whose piston motion is to be reversed with great rapidity, such as are required to operate strokedrills, pumps, or similar machines. The invention consists more particularly in making the valve oscillating and self-reversing by the action upon it of the steam from the cylinder.

A in the drawing represents the steam-cylinder. B is its piston, by preference about half the length of the cylinder. 0 is the steam-chest, of cylindrical form, secured on top or at the side of the cylinder; D, the valve, of cylindricalform, fitted into the chest 0. Steam is admitted into a chamber, a, at one end of the valve, and is thence, through one of two slots b d in the sides of this chambera, conducted to one end of the cylinderAthrough one of the steam passages and ports 0 f of said cylinder. When the chamber a is, with one of its ports or slotssay b-in communication with one of the passages e, as in Fig. 4, the other port or slot, d, is closed against the concave bottom of the chest 0, as is also shown in the same figure, while the other steam-passage, f, which does not communicate with the steam-supply, is converted into an exhaustpassage by causing it to communicate with a recess, 9, on the outer side of the valve D, said recess being directly under the exhaust-pipe F. When the motion of the piston is to be reversed the valve D must be so swung as to bring the port d in communication with the passage f, close the port I), and cause the passage e to enter the recess 9 for exhausting. This reversion of the valve is made automatic by forming a segmental recess, h, in the under side of the valve, and a projecting rib or abutment, i, on the bottom of the chest O,said rib entering the recess. Two apertures, j and Z, lead from and through the top of the cylinder into the steam-chest on opposite sides of the rib i. The piston B is of such length that it will always cover at least one of the openings j l. The position of the valve is determined by the position of the pistonB in as far as the same leaves the one-or the other of the apertures j Z open; for if the steam enters the recess h through the aperture j, as in Fig. 3, and crowds against the shoulder m of the recess h while the aperture l is closed, the steam so swings the valve D as to bring the ports into the position of Fig. 4. But, as soon as the aperture lis opened and j closed, the steam will act against the shoulder a of the recess h, and so swing the valve D as to cause the necessary change of ports for reversing the motion of the piston.

Having thus described my invention, I claim as new and desire to secure by Letters Patent- The cylindrical valve D recessed at g h and slotted at b d, the chest 0 having pipe F and rib i, the cylinder A having inlet-ports e f and apertures j l, and the piston B, all constructed and applied in combination as and for the purpose set forth.

JOHN NORTH.

Witnesses:

A. V. BRIESEN, 'l. B. Mosmm. 

